Added validation for Protocol.get_offset(). If requested field is invalid, then an excaption is raised.
Added validation for Protocol.get_offset().
If requested field is invalid, then an excaption is raised.


git-svn-id: ee7a57951e762bd0bd73821a456cc95fa2e543d2@3163 1105ee14-b0fa-0310-85a5-ff3eed429ff7

umitproject/umpa,umitproject/umpa